# Tailwind CSS v4.1.16 — Release & Upgrade Intelligence
- **Product:** Tailwind CSS (https://tailwindcss.com)
- **Version:** v4.1.16
- **Released:** Oct 23, 2025
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/tailwind/updates/v4.1.16/

## Executive Summary (TL;DR)
Tailwind CSS v4.1.16. Source highlight: Discard candidates with an empty data type (#19172)

## Bug Fixes
- Discard candidates with an empty data type (#19172)
- Fix canonicalization of arbitrary variants with attribute selectors (#19176)
- Fix invalid colors due to nested `&` (#19184)
- Improve canonicalization for `& > :pseudo` and `& :pseudo` arbitrary variants (#19178)

## Upgrade Command
```bash
npm install --save-exact tailwindcss@4.1.16
```